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Dallas Cowboys starting defensive end Anthony Spencer has been experiencing soreness and nagging pain in his left knee to start the year and could potentially be facing season-ending surgery, according to team owner Jerry Jones, via Mike Fisher of 105.3 "The Fan" on Twitter:

Spencer, who earned a Pro Bowl nod last year after recording 11 sacks, underwent arthroscopic knee surgery in late July and played for the first time in Week 2 against the Kansas City Chiefs. The 29-year-old played just over half of the team's defensive snaps but was largely ineffective, recording just two total tackles.

Despite the fact that Dallas is off to a 2-1 start, losing Spencer for the remainder of the season would still be a huge blow. Not only would Dallas be losing an experienced defender with over 90 regular-season appearances under his belt, but it would also be losing one of the franchise's most productive players.

Spencer has 260 total tackles, 32.5 sacks and 12 forced fumbles for the Cowboys since entering the league in 2007 and is obviously a huge key to Dallas' pass rush.

If there's good news for Cowboys fans, though, it's that the team currently ranks second in the NFL in sacks through three weeks with 13 total.

Even without Spencer contributing, Dallas has been successful in its attempts to pressure the quarterback. DeMarcus Ware and Jason Hatcher have combined to record seven sacks through three games while four Cowboys defenders, including Spencer's backup George Selvie, have at least two sacks heading into Week 4.

Prior to 2013, Spencer had missed just six regular-reason games for the Cowboys since the start of his rookie year in 2007. He's already missed two this season and that number could rise if he undergoes knee surgery.